Sooo, I updated my Canon C200 and now I have the XF-AVC format. When I pulled it into Premiere, I had duplicated audio, I only have two inputs, two microphones. If I record in MP4, I only have the two channels of audio.

See my screenshot. Anyone else had this happen. When I spoke to Canon initially, they told me that it was normal for EOS cameras to duplicate audio like this.

Thoughts?

This is exactly how it is supposed to work, and exactly how it works with my C300 Mark II. If you turn off the internal microphone, you'll still have 4 channels, but the last two will be silent.

I can confirm that -- it's working as designed.